Thanks for using HCM, I understand your concern and will try to give you my medical advice, I think is no only about the portion size you need to be aware about what kind a foods are you eating, I recommend you to eat more vegetables and less carbs, avoid drinks with high sugar content, watch any changes in your physical activity, being more active is helpful for lose calories and try to think carefully about what new habits you introduced in your life if you continue gaining weight visit the doctor for an evaluation. I hope that my advice has been helpful and good luck